Printing Address Label from Order (address only, no shipping info)

Please help!
I'm needing to find a way to print address labels only—no shipping, no return address needed. We have our business return address printed on our envelopes and we purchase a special $$ stamp from the post office. I just want an integrated system so when I get an order from Squarespace, I can have it print without having to key each address in every time. I'm on a Mac and willing to buy a label printer if I need to. I just want to get info from someone who is currently doing this (USA).

Thanks much,  ~Judy